Download PHP package on http://windows.php.net/download/.
Install PhpStorm.
Create an “PHP Empty Project”, create php file hello_world.php with following code:
<?php
echo "hello world!";
phpinfo();
?>
Configure PHP setting in: File > Settings > Languages & Frameworks > PHP, such as PHP package dirctory and interpretor:
Right click hello_world.php > Open in Browser > Default, you can get an output on browser like:
